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200x-300x=500+500
We move all terms to the left:
200x-300x-(500+500)=0
We add all the numbers together, and all the variables
200x-300x-1000=0
We add all the numbers together, and all the variables
-100x-1000=0
We move all terms containing x to the left, all other terms to the right
-100x=1000
x=1000/-100
x=-10
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